.container {
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
}
.content{
  width: 700px;
  height: 700px;
  background-color: #ff9800;
  position: relative;
  box-shadow: 0 0 0 10px #2d0609;
}
.ul{
  width: 700px;
  height: 700px;
  flex-wrap: wrap;
}
.li{
  width: 46.6px;
  height: 46.6px;
/*  border: 1px solid red;*/

  display: flex;
  justify-content: center;
  align-items: center;
}
.li .p{
  font-size: 20px;
  color: brown;
}
.black{
  width: 36.6px;
  height: 36.6px;
  margin: 5px;
  background-color: #000;
  border-radius: 20px;
  box-shadow: 1px 1px 1px 1px rgba(0,0,0,.6);
}
.white{
  width: 36.6px;
  height: 36.6px;
  margin: 5px;
  background-color: #fff;
  box-shadow: 1px 1px 1px 1px rgba(0,0,0,.6);
  border-radius: 23.3px;
}
.box{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  width: 653.4px;
  height: 653.4px;
  z-index: -1;
  flex-wrap: wrap;
  box-shadow: 0 0 0 1px #000;
}
.box_li{
  width: 46.6px;
  height: 46.6px;
  border: 1px solid #000;
}
.tips{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  background-color: rgba(255,255,255,.8);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 22px 0;
  border-radius: 10px;
  text-align: center;
  width: 60%;
  color: #000;
}
.tips .btn{
  width: 140px;
  height: 60px;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #2196f3;
  border-radius: 10px;
  margin-top: 20px;
  font-size: 24px;
}
.tips .btn:active{
  opacity: .8;
}